There are many fluids that run throughout your vehicle, but one of the most important to keep track of is the transmission fluid. Whether or not you should change it is not a matter of debate: Yes, you should. But how often this service should be performed varies by manufacturer and vehicle, and it’s open to debate.
The manufacturer’s maintenance schedule for many automatic transmissions doesn’t call for fresh fluid until 100,000 miles or, with some Ford transmissions, even 150,000 miles. A lot of mechanics say that is too long and that it should be done at least every 50,000 miles. Manual transmissions require more conventional gear oil rather than ATF and tend to be on a different maintenance schedule, so it’s best to consult the service intervals in the owner’s manual.
Like other vital automotive fluids, transmission fluid deteriorates over time. Hard use — such as frequent stop-and-go city driving, hauling heavy loads, trailer towing — will accelerate the deterioration. That kind of driving raises the transmission’s operating temperature, and heat puts more strain on the transmission and the fluid. Unlike engine oil, which is primarily a lubricant, transmission fluid serves as both an oil and a hydraulic fluid that helps facilitate gear shifts, cools the transmission and lubricates moving parts.
If you do a
lot of driving under high-stress conditions, you should check the
transmission level more often and have a repair shop check the condition
of the fluid. Transmission fluid often is red but can come in other
colors, and as it deteriorates it tends to turn darker. It may also
acquire a burned odor that could indicate it needs to be changed or that
the transmission is developing mechanical problems.
indication it needs changing is if there are particles or other debris
in the fluid. When you take your vehicle in for an oil change or other
routine service, the repair facility may urge you to pay for a
transmission-fluid change or flush. Even if they can show you that the
fluid is darker than original, that might not mean you need fresh fluid
right now. Step back, check the maintenance schedule in your owner’s
manual and see what the vehicle manufacturer recommends before you
decide. This also will give you time to price shop.
shops use flush systems that force out the old fluid and pump in new
fluid rather than letting the old fluid simply drain out. Though that
sounds good, some manufacturers say you shouldn’t do that (Honda is one;
there are others), so you need to know this before you agree to a
flush. Look in your owner’s manual. Some manufacturers, such as Honda,
also call for their own type of automatic transmission fluid and warn
that using other types could cause damage. Moreover, some automatic
transmissions have filters that should be cleaned or replaced when the
fluid is changed. Make sure the repair facility is using the correct
fluid and procedures for your vehicle.
If you have never
changed the transmission fluid in your vehicle and have more than
100,000 miles on the odometer, should you change it now? We
have seen mixed opinions on this, with some mechanics suggesting you
should just leave well alone if you aren’t having shifting problems.
Adding fuel to this theory are stories about older transmissions failing
shortly after they finally received fresh fluid.